2017-2019年英语四级考试十五选十真题及答案汇总.docxVIP

The method for making beer has changed over time. Hops （啤酒 花）, for example, which give many a modern beer its bitter flavor, are a __26__ recent addition to the beverage. This was first menti oned in reference to brewing in the ninth century. Now, researcher s have found a __27__ ingredient in residue （残留物） from 5000-year-old beer brewing equipment. While digging two pits at a site in the central plains of China, scientists discovered fragme nts from pots and vessels. The different shapes of the containers __ 28__ they were used to brew, filter， and store beer. They may be ancient "beer-making tools," and the e arliest __29__ evidence of beer brewing in China, the researchers reported in the Proceedings of the National Academy of Sciences. To __30__ that theory, the team examined the yellowish, dried __31_ _ inside the vessels. The majority of the grains, about 80%, were f rom cereal crops like barley （大 __32__ lily, which would have made the beer sweeter, the scientist s say. Barley was an unexpected find; the crop was domesticated i n Western Eurasia and didn’t become a __33__ food in central Chin a until about 2,000 years ago, according to the researchers. Based on that timing, they indicate barley may have __34__ in the region not as food, but as __35__ material for beer brewing. A) arrived B) consuming C) direct D) exclusively E) including F) in form G) raw H) reached I) relatively J) remains K) resources L) sta ple M) suggest N) surprising O) test As if you needed another reason to hate the gym, it now turns out t hat exercise can exhaust not only your muscles, but also your eyes . Fear not, however, for coffee can stimulate them again. During _ _26__ exercise, our muscles tire as they run out of fuel and build u p waste products. Muscle performance can also be affected by a __27__ called "central fatigue," in which an imbalance in the bod y's chemical messengers prevents the central nervous system from directing muscle movements __28__. It was not known, how